[sdiy] Interesting Charge-Pump VCO from Electronic Design magazine

[flightofharmony]

http://electronicdesign.com/Articles/ArticleID/21195/21195.html

This design is in the current issue, they claim 0-10kHz with 1% linearity
except in the low end (below ~600Hz, judging by the graph). 
Scaling is 1V/kHz, 0V = 0Hz, 10v = 10kHz
 
No special components, looks like it might be fun to tinker with.

Components: 
(1) LM339 Quad opamp
(5) 1N4148 diodes
(1) 5.1V Zener
(4) ceramic caps - 3 X7R & 1 NPO
(10) 1/8W resistors
(1) 100k potentiometer

Best regards, 

~flight
flight at flightofharmony.com
http://www.flightofharmony.com